钢筋混凝土框架结构倒塌过程中动力效应试验研究

发布时间：2018-02-19 19:39

本文关键词： 动力效应动力增大系数倒塌试验抗连续倒塌 RC框架结构　出处：《湖南大学》2014年硕士论文　论文类型：学位论文

【摘要】：连续倒塌是一个动力效应过程，由于支撑构件失效引起的不平衡重力荷载使结构发生运动而产生动能，该动能需要转化为结构的弹性与非弹性应变能，从而减慢结构向下运动的速度。因此，要避免结构由动力效应导致结构的倒塌，结构必须能够积聚足够的能量使之在达到极限破坏状态前停止运动，为考虑结构倒塌过程中的动力效应，采用等效静力荷载来考虑动力效应是常用的抗连续倒塌设计方法，，对于倒塌过程中的动力增大系数需要通过试验的手段进行验证与研究。 1.本文采用拟静力试验方法完成了一榀单层平面钢筋混凝土框架结构和一榀单层空间混凝土框架结构的抗倒塌性能试验。研究了两榀框架在倒塌过程中的空间效应和悬索作用，探讨了两榀框架结构在倒塌过程中的受力机制转换过程和结构破坏形式，获得了两榀框架结构在抵抗荷载作用时的一些静力参数，为下一步考虑动力效应的倒塌试验设计和数值模拟提供了数据支持。 2.本文采用自制脱钩装置对一榀单层平面钢筋混凝土框架结构进行了模拟移除框架中柱的倒塌性能试验，试验模拟了柱的失效过程、时间以及不同的不平衡荷载工况下结构的动力反应与性能。基于试验结果研究了框架结构在运动过程中处于弹性作用阶段、弹塑性作用阶段和塑性作用阶段时的动力性能，阐述了中柱失效后结构的整个倒塌过程，得到了试验框架在动力效应下的抗倒塌性能。 3.采用ATENA有限元计算软件对本文两榀试验框架和一个试验案例进行了数值模拟分析，计算结果与试验结果吻合良好。建立了三榀框架模型对抗连续性倒塌过程进行数值模拟分析，研究了框架抗倒塌过程中的影响因素，如框架层数等。 4.通过本文中的动力试验数据验证了基于能量平衡原理的抗连续性倒塌评估方法，并利用基于能量平衡原理的抗连续性倒塌评估方法对的五榀数值模拟框架进行抗连续性倒塌评估。
[Abstract]:Continuous collapse is a dynamic process in which kinetic energy is generated by unbalanced gravity load caused by failure of bracing members, which needs to be transformed into elastic and inelastic strain energy of the structure. Therefore, in order to avoid the collapse of the structure caused by dynamic effect, the structure must be able to accumulate enough energy to stop it before it reaches the limit state of failure. In order to consider the dynamic effect during the collapse of a structure, it is a common design method to consider the dynamic effect by using equivalent static load. The dynamic increase coefficient in the collapse process needs to be verified and studied by means of experiments. 1. In this paper, quasi-static test method is used to test the collapse resistance of a single-layer reinforced concrete frame structure and a single-story space concrete frame structure. The spatial effect and cable action of two frames during collapse are studied. In this paper, the mechanical transformation process and failure mode of two frame structures in the process of collapse are discussed, and some static parameters of two frame structures are obtained when they are subjected to loads. It provides data support for the design of collapse test and numerical simulation considering the dynamic effect in the next step. 2. In this paper, a self-made decoupling device is used to simulate the collapse behavior of a single-layer plane reinforced concrete frame structure, and the failure process of the column is simulated. Based on the experimental results, the dynamic behavior of frame structures in elastic, elastic-plastic and plastic stages is studied. The whole collapse process of the structure after the failure of the middle column is described, and the anti-collapse performance of the test frame under the dynamic effect is obtained. 3. Two test frames and one test case are numerically simulated and analyzed by ATENA finite element calculation software. The calculated results are in good agreement with the experimental results. Three frame models are established to deal with the continuous collapse process and the influence factors, such as the number of frame layers, are studied. 4. Through the dynamic test data in this paper, the method of anti-continuity collapse evaluation based on energy balance principle is verified. The anti-continuity collapse assessment method based on energy balance principle is used to evaluate the anti-continuity collapse of five numerical simulation frames.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.4;TU311.3

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